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Unformatted text preview: 1 Virginia Tech Department of Civil and Environmental Engineering CEE 4324/5984 Open Channel Flow General Procedures and Guidelines for using HEC-RAS The HEC-RAS program separates the process of modeling surface water profiles into five sub-tasks: 1. Getting started 2. Defining Geometric data 3. Defining Flow data 4. Providing Plan or operational information 5. Examining output Getting Started When you first open HEC-RAS, you will be presented with the overall control window shown below: To start a new analysis choose, File: New Project and you will be presented with a browser window to control the file name and disk location where your analysis will be stored. You will also be told that, by default, HEC-RAS uses English units, but that this can be changed under Options. Geometric Data Click on the symbol to being the entry of geometric data. Geometric data describe the properties of reach in which flow is to occur. This information includes cross- sectional information, longitudinal information (slope and separation distances between cross-sections, and roughness characteristics. In our assignment, the cross-sectional shape will not be changing, so your efforts amount to being sure to define enough cross- sections that the curvature of the profile is adequately described and has enough distance to fully evolve. You will first be greeted by the window shown below: 2 Click on the River Reach tool (leftmost tool across the top) and draw a single arbitrary segment in the large blank area by clicking, dragging and double- clicking to draw a single line segment. You will be asked to give a River: name and a Reach: name....
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- Fall '11